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pid: kill the obsolete PIDTYPE_PID code in transfer_pid()

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transfer_pid() must be never called with pid == PIDTYPE_PID,
new_leader->thread_pid should be changed by exchange_tids().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20240202131255.GA26025@redhat.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Oleg Nesterov 2024-02-02 14:12:55 +01:00 committed by Christian Brauner
parent 90f92b68c9
commit a1c6d5439f
1 changed files with 1 additions and 2 deletions
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3
kernel/pid.c
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@ -396,8 +396,7 @@ void exchange_tids(struct task_struct *left, struct task_struct *right)
void transfer_pid(struct task_struct *old, struct task_struct *new,
enum pid_type type)
{
if (type == PIDTYPE_PID)
new->thread_pid = old->thread_pid;
WARN_ON_ONCE(type == PIDTYPE_PID);
hlist_replace_rcu(&old->pid_links[type], &new->pid_links[type]);
}